Electrical delay device of unitary configuration

ABSTRACT

Disclosed herein is a delay device of unitary configuration in which a ground-side capacitor electrode is sandwiched between at least one surface of a magnetic core and one surface of a dielectric sheet. Several parallel capacitor electrodes are positioned on the other side of the dielectric sheet, and a coil is wound around the resulting laminar assembly and is connected to each of the parallel capacitor electrodes.

United States Patent Inventor Kazuo Kameya Yokohama-shi, Japan Appl. No.825,909

Filed May 19, 1969 Patented Jan. 11, 1972 Assignee Toko Kabushiki KaishaTokyo-To, Japan Priority Dec. 14, 1968 Japan 43/ 9 l 730 ELECTRICALDELAY DEVICE 0F UNITARY CONFIGURATION 6 Claims, 5 Drawing Figs.

US. Cl 333/29, 333/30, 333/84 M, 333/24.l

Int. Cl 03h H03h 7/30 Field 01 Search 333/30, 31,

Primary Examiner-Eli Lieberman Assistant Examiner-C. Baraff Attorneys-Robert E. Burns and Emmanuel J. Lobato ABSTRACT: Disclosed herein is adelay device of unitary configuration in which a groundside capacitorelectrode is sandwiched between at least one surface of a magnetic coreand one surface of a dielectric sheet. Several parallel capacitorelectrodes are positioned on the other side of the dielectric sheet, anda coil is wound around the resulting laminar assembly and is connectedto each of the parallel capacitor electrodes.

ELECTRICAL DELAY DEVICE E UNITARY CONFIGURATION BACKGROUND OF THEINVENTION pedance cannot be produced. For this reason, this type ofdelay device is unsuitable for use in high-speed pulse circuits.

On the other hand, a lumped-constant type device of low impedance inwhich a coil and a large number of capacitors are combined therein hasthe drawback of tending to become considerably large in bulk and tobecome expensive.

SUMMARY OF THE INVENTION It is an object of the present invention toprovide a low-impedance delay device which is highly suitable for use inhighspeed pulse circuits and yet is of small size and low price. Thepresent invention contemplates achievement of this object and otherobjects through the use of at least one fixed capacitor in the delaydevice thereby to provide an organization approaching that of a deviceof distributed-constant type.

According to the present invention, briefly summarized, there isprovided a delay device characterized by an organization wherein a coilis wound around a laminar assembly of a dielectric sheet bonded onto atleast one surface of a magnetic core with a ground-side electrodeinterposed therebetween and a plurality of capacitor electrodes disposedon the outer surface of the dielectric sheet opposite the ground-sideelectrode, each capacitor electrode being connected to the coil. 7

, In a modified form of the delay device of the invention, additionalmagnetic structures are disposed outside of the coil.

The nature, principle, details, and utility of the invention will bemore clearly apparent from the following detailed description withrespect to preferred embodiments of the invention when read inconjunction with the accompanying drawings, in which like parts aredesignated by like reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. I is a perspective view showing one example of a delay deviceaccording to the invention;

FIG. 2 is a sectional view of the device illustrated in FIG. 1;

FIGS. 3 and 4 are sectional views respectively showing other examples ofdelay devices embodying the invention; and

FIG. 5 is an equivalent circuit diagram of a delay device according tothe invention.

DETAILED DESCRIPTION In one embodiment of the invention as illustratedin FIGS. 1 and 2, a dielectric sheet 3 made of a material such as aceramic or mica is provided on one surface (outer surface) thereof withseveral capacitor electrodes I and on the opposite surface (innersurface) with a ground-side electrode 2 in a weft weaving configurationby a method such as printing. The capacitor electrodes 1 are in the formof strips disposed in parallel spaced-apart arrangement and areperpendicular to the parallel reciprocating passes of the groundelectrode 2. A magnetic core 4 of a material such as a ferrite is bondedto the inner surface of the dielectric sheet 3, and a coil 5 is woundcontinuously around the resulting assembly along the capacitorelectrodes 1, one coil turn being wound over each electrode l.

In this delay device, the coil 5 employs a space winding with a pitchequal to the pitch or spacing of the capacitor electrodes l. The pitchand the wire diameter of the coil 5 and material properties of theferrite core are suitably selected, and the coil is thereby adapted tohave a desired degree of coupling with a mutually neighboring winding.

While an ordinary insulated conductor wire may be used for the coil 5,-Ihave found that, by using a bare conductor wire, i.'e., without a coatedinsulating film or a wire plated with a material such as solder, it ispossible to connect the coil 5 and capacitor electrodes 1 directly by aprocedure such as soldering by heating and thereby to form a delaycircuit as indicated by an equivalent circuit in FIG. 5.

That is, the inductance L of the coil 5 and the electrostaticcapacitance C between the ground electrodes 2 can be advantageouslyutilized to cause the device to possess a delay performance equivalentto that of a lumped-constant type delay device. I

In another example of the invention as illustrated in FIG. 3 externalmagnetic structures 6 of a material such as a ferrite are disposed onthe outer sides of delay device in order to increase the inductance. Instill another example of the invention as shown in FIG. 4, a dielectricsheet 3 is bonded onto each of the two sides of the magnetic core 4.

Accordingly, it should be understood that the present disclosure relatesto only preferred embodiments of the invention and that it is intendedto cover all changes and modifications of the examples herein chosen forthe purposes of the disclosure, which do not constitute departures fromthe spirit and scope of the invention.

In all forms of the delay device according to the invention, the deviceshave the structurally advantageous features of small size and low costsimilarly as devices of the distributedconstant type and thefunctionally advantageous features of low impedance similarly as devicesof the lumped-constant type and, moreover, of relatively large delaymagnitude in spite of the small size of the devices. Accordingly, thedelay device of the invention is highly suitable for use in variouscircuits including even high-speed pulse circuits.

I claim:

1. An electrical delay device of unitary configuration comprising, incombination, at least one rigid plate-shaped dielectric sheet, aplurality of capacitor electrodes disposed on one principal surface ofsaid dielectric sheet, a ground-side electrode disposed on the otherprincipal surface of the dielectric sheet and arranged to cross saidplurality of capacitor electrodes so that said ground-side electrode andsaid capacitor electrodes are intercepted by a corresponding pluralityof lines disposed normal to said dielectric sheet, a plate-shapedmagnetic core bonded to said other surface of the dielectric sheet withsaid ground-side electrode interposed therebetween, and a coil woundaround the resulting assembly of said capacitor electrodes, dielectricsheet, ground-side electrode, and magnetic core and electricallyconnected to each of the capacitor electrodes.

2. An electrical delay device of unitary configuration as claimed inclaim 1, in which said capacitor electrodes, and said ground-sideelectrode comprise conductors printed on said rigid dielectric sheet.

3. An electrical delay device of unitary configuration as claimed inclaim I, further comprising two outer sheets of magnetic material, saidcapacitor electrodes, dielectric sheet, ground-side electrode, magneticcore, and coil being connected between said two outer sheets.

4. An electrical delay device of unitary configuration as claimed inclaim I, in which said capacitor electrodes are arranged in a paralleland spaced-apart disposition, said coil is wound so as to contact eachsaid capacitor electrode, and said coil is soldered to each saidcapacitor electrode.

5. An electrical delay device of unitary configuration comprising incombination, a plate-shaped magnetic core having two opposed principalsurfaces, two ground-side electrodes disposed respectively on saidopposed core surfaces, two rigid plate-shaped dielectric sheets eachhaving one principal surface bonded respectively to said opposed coresurfaces with said respective ground-side electrodes interposedtherebetween, a plurality of capacitor electrodes disposed'on the otherprincipal surfaces of each said dielectric sheet, a coil wound about theresulting assembly of said electrodes, dielectric sheets and magneticcore and electrically connected to each of said capacitor electrodes,and two outer sheets of magnetic material, said capacitor electrodes,dielectric sheets, ground-side electrodes, magnetic core, and coil beingconnected between said two outer sheets.

6. An electrical delay device of unitary configuration comprising, incombination, a plate-shaped magnetic core having two opposed principalsurfaces, two ground-side electrodes disposed respectively on saidopposed core surfaces, two rigid plate-shaped dielectric sheets eachhaving one principal surface bonded respectively to said opposed coresurfaces with said respective ground-side electrodes interposedtherebetween, a plurality of capacitor electrodes disposed on the otherprincipal surfaces of each said dielectric sheet, a coil wound about theresulting assembly of said electrodes, dielectric sheets and magneticcore and electrically connected to each of said capacitor electrodes,wherein said plurality of capacitor electrodes on each said dielectricsheet are arranged in a parallel spaced-apart disposition, said coil iswound so as to contact each said capacitor electrode, and said coil issoldered to each said capacitor electrode.

i l i i

1. An electrical delay device of unitary configuration comprising, incombination, at least one rigid plate-shaped dielectric sheet, aplurality of capacitor electrodes disposed on one principal surface ofsaid dielectric sheet, a ground-side electrode disposed on the otherprincipal surface of the dielectric sheet and arranged to cross saidplurality of capacitor electrodes so that said ground-side electrode andsaid capacitor electrodes are intercepted by a corresponding pluralityof lines disposed normal to said dielectric sheet, a plate-shapedmagnetic core bonded to said other surface of the dielectric sheet withsaid ground-side electrode interposed therebetween, and a coil woundaround the resulting assembly of said capacitor electrodes, dielectricsheet, ground-side electrode, and magnetic core and electricallyconnected to each of the capacitor electrodes.
 2. An electrical delaydevice of unitary configuration as claimed in claim 1, in which saidcapacitor electrodes, and said ground-side electrode compRise conductorsprinted on said rigid dielectric sheet.
 3. An electrical delay device ofunitary configuration as claimed in claim 1, further comprising twoouter sheets of magnetic material, said capacitor electrodes, dielectricsheet, ground-side electrode, magnetic core, and coil being connectedbetween said two outer sheets.
 4. An electrical delay device of unitaryconfiguration as claimed in claim 1, in which said capacitor electrodesare arranged in a parallel and spaced-apart disposition, said coil iswound so as to contact each said capacitor electrode, and said coil issoldered to each said capacitor electrode.
 5. An electrical delay deviceof unitary configuration comprising in combination, a plate-shapedmagnetic core having two opposed principal surfaces, two ground-sideelectrodes disposed respectively on said opposed core surfaces, tworigid plate-shaped dielectric sheets each having one principal surfacebonded respectively to said opposed core surfaces with said respectiveground-side electrodes interposed therebetween, a plurality of capacitorelectrodes disposed on the other principal surfaces of each saiddielectric sheet, a coil wound about the resulting assembly of saidelectrodes, dielectric sheets and magnetic core and electricallyconnected to each of said capacitor electrodes, and two outer sheets ofmagnetic material, said capacitor electrodes, dielectric sheets,ground-side electrodes, magnetic core, and coil being connected betweensaid two outer sheets.
 6. An electrical delay device of unitaryconfiguration comprising, in combination, a plate-shaped magnetic corehaving two opposed principal surfaces, two ground-side electrodesdisposed respectively on said opposed core surfaces, two rigidplate-shaped dielectric sheets each having one principal surface bondedrespectively to said opposed core surfaces with said respectiveground-side electrodes interposed therebetween, a plurality of capacitorelectrodes disposed on the other principal surfaces of each saiddielectric sheet, a coil wound about the resulting assembly of saidelectrodes, dielectric sheets and magnetic core and electricallyconnected to each of said capacitor electrodes, wherein said pluralityof capacitor electrodes on each said dielectric sheet are arranged in aparallel spaced-apart disposition, said coil is wound so as to contacteach said capacitor electrode, and said coil is soldered to each saidcapacitor electrode.